60 ml is quite a bit, but if it keeps you off of analogs that's OK. Do you have any ill effects? Like dizziness, headaches, bleeding gums,etc. If not, you are not overdosing, you are doing what you need to to stay off the stinkies. What strength are you using? Maybe you could up it a little & vape less. The important part of your smoke-free journey at this point is to vape enough to stave off the need for cigarettes (and not overdose, of course.) You can cut back after the urges to smoke go away. You CAN do this! I smoked for over 45 years & have been smoke-free for over a year & a half. Keep on vapin' & if you need help there a lot of people on this forum who can & will help you.